CN111254800A - Combined beam suitable for urban bridge and construction method thereof - Google Patents

Combined beam suitable for urban bridge and construction method thereof Download PDF

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Publication number
CN111254800A
CN111254800A CN202010201545.4A CN202010201545A CN111254800A CN 111254800 A CN111254800 A CN 111254800A CN 202010201545 A CN202010201545 A CN 202010201545A CN 111254800 A CN111254800 A CN 111254800A
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CN
China
Prior art keywords
steel
beams
longitudinal
cast
fulcrum
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CN202010201545.4A
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Chinese (zh)
Inventor
贺耀北
刘榕
李文武
耿少波
陈�光
郑力之
曹伟
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Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
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Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
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Application filed by Hunan Provincial Communications Planning Survey and Design Institute Co Ltd filed Critical Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
Priority to CN202010201545.4A priority Critical patent/CN111254800A/en
Publication of CN111254800A publication Critical patent/CN111254800A/en
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D1/00Bridges in general
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/12Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • E01D19/125Grating or flooring for bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

Abstract

The utility model provides a combination beam suitable for urban bridge, includes the coincide sub-roof beam of multi-disc parallel arrangement, the coincide sub-roof beam includes steel longeron and precast concrete decking, has set firmly the shear force spare on the steel longeron, is equipped with horizontal, vertical and anchor reinforcing bar in the precast decking, and horizontal reinforcing bar and vertical reinforcing bar stretch out to the outside, and the anchor reinforcing bar stretches out to the top, is equipped with vertical cast-in-place seam between the adjacent precast decking, is equipped with the cast-in-place decking of concrete on each precast decking and the vertical cast-in-place seam. The construction method comprises the following steps: manufacturing a steel longitudinal beam and presetting a shear part; erecting a prefabricated bridge deck formwork, laying steel bars in the prefabricated bridge deck, pouring prefabricated bridge deck concrete, demolding and storing to form a superposed sub-beam; transferring and hoisting the superposed sub-beams to be placed on the temporary support; pouring cast-in-place bridge decks and longitudinal cast-in-place seams; and (5) installing a permanent support and dismantling the temporary support. The invention has the advantages of light dead weight, convenient construction, capability of fully exerting the advantages of a combined structure, reasonable stress, strong bearing capacity and the like.

Description

Combined beam suitable for urban bridge and construction method thereof
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a composite beam suitable for an urban bridge and a construction method thereof.
Background
In urban bridge construction, more and more attention is paid to concepts of reducing traffic barrier influence, paying attention to environmental protection and pursuing project quality and benefits, so that the selection of a proper structural form and a corresponding construction method to meet the construction concept of 'quickness, environmental protection and high efficiency' is a key and difficult point of urban bridge design.
In recent years, the construction of urban bridges enters a rapid development period, and the proportion of prefabricated assembly beams in the urban bridges is increasing day by day. Although the traditional prefabricated assembly structure (such as a prefabricated small box girder and a hollow slab) is mature in design and construction, the construction period is long, the tonnage of transportation and erection is large, the requirements on construction conditions and equipment are high, and the traffic interference is large. The steel plate composite beam is formed by connecting two materials of steel and concrete into a whole, the tensile property of the steel and the compressive property of the concrete are fully exerted, and compared with the traditional prefabricated assembly structure, the steel plate composite beam has the advantages of high bearing capacity, light dead weight, high rigidity and ductility, good anti-seismic property, convenience in construction and the like. However, the traditional steel plate composite beam still has a large amount of wet operation in site construction, and a large amount of templates are needed in the construction process; the steel structure and the concrete bridge deck are respectively processed and prefabricated, a steel beam is erected firstly during construction, then the prefabricated bridge deck is installed, and finally a wet joint is poured. This construction method has the following problems: 1. the steel beam bears most of the dead load, and the minor loads such as pavement and live load are borne by the combined beam, so that the advantages of the combined structure are not fully exerted. Further, this atress mode causes the roof beam height of girder steel to increase, and the girder needs to set up vertical and level and puts more energy into, increases the construction degree of difficulty. When the net height is limited, the line position needs to be raised, and the construction cost is increased; 2. the bridge deck is generally prefabricated in longitudinal sections due to the hoisting capacity and the structural form, transverse penetrating joints inevitably exist, the field workload is large, the quality is not easy to control, and the transverse penetrating joints become weak points of the structure; 3. when the structure system adopts the continuous beam, the connecting joint is usually arranged at the position of a span with smaller bending moment, a temporary pier needs to be arranged, the connection of the steel beam is completed at high altitude, the construction difficulty is large, the construction precision is low, and the measure cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the composite beam which has light dead weight, convenient construction, reasonable stress and strong bearing capacity, can fully exert the advantages of a composite structure and is suitable for urban bridges.
The invention further provides a construction method of the composite beam suitable for the urban bridge.
In order to solve the technical problems, the invention adopts the following technical scheme:
the composite beam suitable for the urban bridge comprises a plurality of superposed sub-beams which are arranged in parallel along the transverse direction, each superposed sub-beam comprises a steel longitudinal beam and a concrete prefabricated bridge deck, a shear part is fixedly arranged on each steel longitudinal beam and extends to the upper side of the prefabricated bridge deck, transverse reinforcing steel bars, longitudinal reinforcing steel bars and anchoring reinforcing steel bars are arranged in the prefabricated bridge deck, each transverse reinforcing steel bar and each longitudinal reinforcing steel bar extend to the outer side of the prefabricated bridge deck, each anchoring reinforcing steel bar extends to the upper side of the prefabricated bridge deck, a concrete longitudinal cast-in-place seam is arranged between every two transversely adjacent prefabricated bridge decks, and each prefabricated bridge deck and each longitudinal cast-in-place seam are provided with a concrete cast-in-place.
As a further improvement of the above technical solution: and a midspan steel cross beam is fixedly arranged between two transversely adjacent steel longitudinal beams. The cross-middle steel beam can improve the mechanical property of the system, and the steel longitudinal beam has strong local stability.
As a further improvement of the above technical solution: the thickness of the lower part of the prefabricated bridge deck in contact with the steel longitudinal beam is larger than that of the two sides of the prefabricated bridge deck. The thickness of the contact position of the lower part of the prefabricated bridge deck and the steel longitudinal beam is increased to form an inverted trapezoidal section, so that the self stress performance of the prefabricated bridge deck is improved.
As a further improvement of the above technical solution: the composite beam is characterized by further comprising two side fulcrum beams (namely beams positioned at two ends of the bridge), at least one middle fulcrum beam (multiple paths are needed to be arranged) is arranged between the two side fulcrum beams, and multiple laminated sub-beams are connected between the side fulcrum beams and the middle fulcrum beams close to the side fulcrum beams and between the side fulcrum beams and the middle fulcrum beams and between the adjacent two middle fulcrum beams.
As a further improvement of the above technical solution: the side fulcrum crossbeam and the middle fulcrum crossbeam are cast-in-place crossbeams, a post-cast section is reserved at one end, close to the middle fulcrum crossbeam, of the cast-in-place bridge deck, and the upper end of the middle fulcrum crossbeam extends to the post-cast section. The side fulcrum beam and the middle fulcrum beam are both cast-in-place beams, and only a longitudinal cast-in-place seam and a pier top cast-in-place beam are arranged in the system, so that a transverse through seam in a main stress direction is avoided, weak points and cracking risks of the structure are reduced, and the structure redundancy is higher; the cast-in-place decking leaves the post-cast section near the one end of well fulcrum crossbeam, and corresponding well fulcrum crossbeam upper end extends to the post-cast section for the cast-in-place well fulcrum crossbeam cross-section is T font cross-section, compares conventional rectangular cross-section, has better mechanical properties and anti-cracking performance, and the structure also has better wholeness.
As a further improvement of the above technical solution: the middle fulcrum beam is a high-performance concrete cast-in-place beam. The addition of high performance concrete can be connected the coincide sub-roof beam of both sides as an organic whole, and the seam position can reach better mechanical properties than timber, connects more reliably.
As a further improvement of the above technical solution: the steel beam is characterized in that the edge fulcrum cross beam and the middle fulcrum cross beam are both steel cross beams, a plurality of first connecting longitudinal beams are reserved on the inner side of the edge fulcrum cross beam along the length direction, the first connecting longitudinal beams are fixedly connected with the steel longitudinal beams close to the edge fulcrum cross beam in a one-to-one correspondence mode, a plurality of second connecting longitudinal beams are reserved on two sides of the middle fulcrum cross beam along the length direction, and the second connecting longitudinal beams are fixedly connected with the steel longitudinal beams close to the middle fulcrum cross beam in a one-to-one. Compared with a cast-in-place beam, the side fulcrum beam and the middle fulcrum beam are steel beams, concrete pouring and maintenance at the position of the middle fulcrum beam can be eliminated, construction is convenient and fast, construction period is saved, connection is reliable, furthermore, a cover beam can be omitted, the height of the whole structure is reduced, linear position is reduced, engineering cost is saved, and the urban overhead bridge with limited clear height has wide exertion space.
The construction method of the combination beam suitable for the urban bridge comprises the following steps:
s1, manufacturing each steel longitudinal beam and presetting a shearing force piece on each steel longitudinal beam;
s2, erecting a prefabricated bridge deck template, laying transverse reinforcing steel bars, longitudinal reinforcing steel bars and anchoring reinforcing steel bars in the prefabricated bridge deck, pouring prefabricated bridge deck concrete, demolding and storing to form superposed sub-beams;
s3, transferring the superposed sub-beams to a bridge site, and hoisting each superposed sub-beam to be placed on the pier top temporary support;
s4, laying a cast-in-situ bridge deck and a reinforcing mesh at the longitudinal cast-in-situ seam, and pouring cast-in-situ bridge deck and longitudinal cast-in-situ seam concrete;
s6, after the concrete strength meets the design requirement, installing a permanent support, and removing a temporary support to complete the system conversion from simple support to continuous support;
and S7, constructing auxiliary facilities of the bridge floor to finish full-bridge construction.
As a further improvement of the above technical solution: when the side fulcrum beam and the middle fulcrum beam adopt cast-in-place beams, correspondingly, in step S4, after cast-in-place bridge decks and longitudinal cast-in-place slit concrete are poured, steel bars of the side fulcrum beam and the middle fulcrum beam are bound, and then concrete of the side fulcrum beam and the middle fulcrum beam is poured.
As a further improvement of the above technical solution: when the side fulcrum cross beam and the middle fulcrum cross beam are made of steel cross beams, correspondingly, in the step S1, the side fulcrum cross beam and the middle fulcrum cross beam are made while making each steel longitudinal beam, in the step S3, the side fulcrum cross beam and the middle fulcrum cross beam are hoisted firstly, then each superposed sub beam is hoisted, and the superposed sub beams are fixedly connected with the corresponding side fulcrum cross beam or middle fulcrum cross beam to complete full-bridge erection.
Compared with the prior art, the invention has the advantages that: the invention discloses a composite beam suitable for urban bridges, wherein a transverse bridge direction adopts a plurality of overlapped sub-beams which are arranged in parallel, a steel longitudinal beam of each overlapped sub-beam and a lower deck slab are integrally prefabricated, the prefabricated deck slab participates in stress as a part of the deck slab and commonly bears all dead load and live load, the stress is more reasonable, each overlapped sub-beam is transversely connected through an upper cast-in-place deck slab and a longitudinal cast-in-place seam, the steel longitudinal beam is connected with the lower deck prefabricated deck slab and the upper cast-in-place deck slab through a shear member, the lower deck prefabricated deck slab is connected through an anchoring steel bar and the upper cast-in-place deck slab, the deck slab and the steel longitudinal beam are connected into a whole, the connection performance and the integral stress performance of a main beam are ensured, the system can fully exert the advantages of a steel-concrete composite structure, the beam height of the steel longitudinal beam is reduced, the line position is reduced, and is, the method is beneficial to saving steel and reducing the engineering cost, and has obvious overall advantages; the steel longitudinal beams of the superposed sub-beams and the lower deck slab are integrally prefabricated, the upper deck slab is integrally cast in place, only longitudinal cast-in-place seams and pier top cast-in-place beams are arranged in the system (under the condition that the middle fulcrum beam adopts the concrete cast-in-place beam), transverse penetrating seams in the main stress direction are avoided, the weak points and the cracking risks of the structure are reduced, the structural performance is more reliable, the durability is good, and the redundancy is higher; the superposed sub-beams can be prefabricated, transported and installed in a whole span, and the longitudinal continuous joints are arranged at the tops of the piers, so that temporary piers are not needed, the construction difficulty is reduced, and the construction cost is saved; the superposed sub-beams only comprise the steel beams and the lower-layer precast slabs, so that the difficulty caused by manufacturing and transporting large-size precast slabs is reduced, the hoisting weight is greatly reduced, the difficulty of hoisting construction is reduced, conventional equipment can be utilized to the greatest extent, and the investment is saved; the bridge deck span and the girder arrangement interval are equivalent to those of a prefabricated T beam and a small box girder, the transverse prestress of the bridge deck is not required to be set, the structure is simple, the construction is convenient and fast, and the structural robustness is obviously superior to that of a conventional steel plate composite beam with few girders.
The construction method of the composite beam suitable for the urban bridge, disclosed by the invention, has the advantages that the superposed sub-beams are prefabricated in whole span, transported and installed, the longitudinal continuous joints are arranged at the pier tops, temporary piers are not needed to be arranged, the construction difficulty is reduced, the construction cost is saved, and the lower-layer prefabricated bridge deck plate plays a role of a template when the cast-in-place bridge deck plate is poured, so that the construction can be simplified, and the construction cost is reduced.
Drawings
Fig. 1 is a schematic structural view of a composite beam suitable for urban bridges according to the present invention.
Fig. 2 is a schematic view of the internal structure of the laminated sub-beam of the present invention.
Fig. 3 is a schematic top view of the composite girder according to the present invention, which is suitable for urban bridges.
Fig. 4 is a schematic structural view of a midspan steel beam in the present invention.
Fig. 5 is a schematic structural view of a fulcrum cast-in-place beam in the first embodiment of the invention.
Fig. 6 is a schematic structural view of a steel cross beam in the second embodiment of the present invention.
Fig. 7 is a schematic structural view of a middle fulcrum steel beam in the second embodiment of the invention.
Fig. 8 is a schematic structural view of a side fulcrum steel beam in the second embodiment of the present invention.
The reference numerals in the figures denote: 1. overlapping the sub-beams; 11. a steel stringer; 12. prefabricating a bridge deck; 13. a shear member; 14. transverse reinforcing steel bars; 15. longitudinal reinforcing steel bars; 16. anchoring the reinforcing steel bars; 17. longitudinally casting a seam in situ; 18. casting a bridge deck in situ; 19. post-pouring section; 2. a side fulcrum beam; 21. a first connecting stringer; 3. a middle fulcrum beam; 31. a second connecting longitudinal beam; 4. midspan steel beams.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
Example one
Fig. 1 to 5 show a first embodiment of the composite girder suitable for urban bridges according to the present invention, wherein the composite girder suitable for urban bridges of the present embodiment comprises 6 laminated sub-girders 1, and the transverse distance between two adjacent laminated sub-girders 1 is 2.3 m. Each laminated sub-beam 1 comprises a steel longitudinal beam 11, a prefabricated deck slab 12, shear members 13 (such as conventional shear nails or the like), anchoring bars 16, and the like. The steel longitudinal beam 11 has an I-shaped section, the beam height is 1100mm, and the steel longitudinal beam comprises a steel longitudinal beam top plate, a steel longitudinal beam web plate and a steel longitudinal beam bottom plate, wherein the steel longitudinal beam top plate is 400mm wide and 16mm thick; the height of a web plate of the steel longitudinal beam is 1060mm, and the thickness of the web plate is 16 mm; the width of the bottom plate of the steel longitudinal beam is 600mm, and the thickness of the bottom plate of the steel longitudinal beam is 24 mm. The width middle beam and the side beams on two sides of the prefabricated bridge deck 12 are 1900mm and 1800mm respectively, the thickness is 150mm, and the included prefabricated slab longitudinal steel bars 15 and the prefabricated slab transverse steel bars 14 extend out of the outer side of the prefabricated bridge deck 12 and are convenient to lap to be connected into a whole. The superposed sub-beams 1 are connected into a whole in the transverse bridge direction through cast-in-place bridge decks 18 and longitudinal cast-in-place seams 17, the thickness of each cast-in-place bridge deck 18 is 150mm, and the cast-in-place bridge decks are connected with the steel longitudinal beams 11 and the prefabricated bridge decks 12 through the shearing pieces 13 and the anchoring steel bars 16 respectively. The width of the longitudinal cast-in-place seam 17 is 400mm, the thickness is 150mm, and longitudinal common steel bars, transverse common steel bars and vertical common steel bars are arranged in the longitudinal cast-in-place seam and connected with the transverse steel bars 14 of the prefabricated slab. The superposed sub-beam 1 is longitudinally provided with two or more cast-in-place beams, the beam heights of the side pivot cast-in-place beam and the middle pivot cast-in-place beam are 1400mm, and the side pivot cast-in-place beam and the middle pivot cast-in-place beam are respectively connected with the superposed sub-beam 1 into a whole.
Further, in this embodiment, each laminated sub-beam 1 is transversely connected to a mid-span steel beam 4, which has an i-shaped cross section and a beam height of 600mm, in addition to a cast-in-place bridge deck 18 and a longitudinal cast-in-place slit 17, and includes a mid-span steel beam web, a mid-span steel beam top plate and a mid-span steel beam bottom plate. The middle-span steel crossbeam top plate and the middle-span steel crossbeam bottom plate are both 300mm wide and 16mm thick; the height of the steel beam web is 568mm, and the thickness of the steel beam web is 16 mm. And the middle-span steel cross beam 4 and each laminated sub-beam 1 are fixedly connected through a plurality of splicing plates and high-strength bolts.
During construction, firstly, steel beam segments are manufactured, splicing of each hole of steel longitudinal beam 11 is completed in a prefabrication factory, then, the bridge deck 12 is prefabricated on the steel longitudinal beams 11, and after the strength of concrete reaches the designed strength, demolding and storing are carried out to form the superposed sub-beams 1; and then, the superposed sub-beams 1 are transported to a bridge position, hoisted and installed by using a crane, after the full-bridge erection is finished, cast-in-place bridge deck plates 18 and longitudinal cast-in-place seams 17 are poured, and finally, the side fulcrum beams 2 and the middle fulcrum beams 3 are poured, so that the conversion from a simple support to a continuous system is finished.
The construction method of the composite beam suitable for the urban bridge of the embodiment specifically comprises the following steps:
1) the method comprises the following steps of processing and manufacturing a steel longitudinal beam top plate, a steel longitudinal beam web plate and a steel longitudinal beam bottom plate of a steel longitudinal beam 11 in beam-dividing sections, a midspan steel cross beam 4 web plate, a midspan steel cross beam top plate and a midspan steel cross beam bottom plate, and a splicing steel plate for connecting the midspan steel cross beam 4 and each superposed sub-beam 1, welding shear nails on the top plate of the steel longitudinal beam 11, and completing splicing of each hole main beam section and the midspan cross beam section;
2) erecting a prefabricated bridge deck 12 template on a prefabricated pedestal of a prefabrication factory, laying prefabricated slab longitudinal steel bars 15, prefabricated slab transverse steel bars 14 and anchoring steel bars 16, pouring prefabricated bridge deck 12 concrete, demolding when the strength of the concrete reaches over 90 percent of a design value, and storing to form a superposed sub-beam 1;
3) the superposed sub-beams 1 are transported to a bridge site through beam transporting equipment, and the superposed sub-beams 1 and the midspan steel beam 4 are hoisted and installed on the temporary support;
4) laying a cast-in-situ bridge deck 18 and a reinforcing mesh at the longitudinal cast-in-situ joint 17, and pouring cast-in-situ bridge deck 18 and longitudinal cast-in-situ joint 17 concrete;
5) binding reinforcing steel bars of the side fulcrum beam 2 and the middle fulcrum beam 3, and pouring concrete of the side fulcrum beam 2 and the middle fulcrum beam 3;
6) after the strength of the concrete reaches the design strength, installing a permanent support, and dismantling the temporary support to complete the system conversion from simple support to continuous support;
7) and constructing bridge deck pavement, railings and other accessory facilities to complete full-bridge construction.
Example two
Fig. 6 to 8 show a second embodiment of the composite beam suitable for the urban bridge, which is substantially the same as the first embodiment, except that the middle fulcrum cross beam 3 and the side fulcrum cross beam 2 both use steel cross beams, the side fulcrum steel cross beam has a beam height of 1300mm and a width of 1100mm, and the side fulcrum steel cross beam has a bottom plate 21 with a width of 1500mm and a thickness of 28mm, and is longitudinally connected with the steel longitudinal beam 11 through the first connecting longitudinal beam 21, wherein the top plate of the first connecting longitudinal beam 21 is connected with the top plate of the steel longitudinal beam 11 by welding, the web plate of the first connecting longitudinal beam 21 is fixedly connected with the web plate of the steel longitudinal beam 11 through a splicing steel plate and a high-strength bolt, and the bottom plate of the first connecting longitudinal beam 21 is fixedly connected with the web plate of the steel longitudinal beam 11 through a splicing steel plate; the roof beam height 1300mm of well fulcrum steel crossbeam, 1500mm wide, the bottom plate 23 of well fulcrum steel crossbeam is wide 1900mm, 28mm thick, it is vertical to connect longeron 31 and steel longeron 11 through the second that both sides were reserved to link to each other, wherein, longeron 31 roof is connected through welded connection with 11 roofs of steel longeron to the second, and longeron 31 web is connected through concatenation steel sheet and high strength bolt fixed connection with 11 webs of steel longeron to the second, and longeron 31 bottom plate is connected through concatenation steel sheet and high strength bolt fixed connection with 11 webs of steel longeron to the second.
The construction method of the composite beam suitable for the urban bridge of the embodiment is as follows:
1) the method comprises the following steps of processing and manufacturing a steel longitudinal beam top plate, a steel longitudinal beam web plate and a steel longitudinal beam bottom plate of a steel longitudinal beam 11 in beam sections, an edge fulcrum steel cross beam, a middle fulcrum steel cross beam, a midspan steel cross beam 4 web plate, a midspan steel cross beam top plate and a midspan steel cross beam bottom plate, and a splicing steel plate for connecting the midspan steel cross beam 4 and each laminated sub-beam 1, welding shear nails on the top plate of the steel longitudinal beam 11, and completing splicing of each hole main beam section and the midspan cross beam section;
2) erecting a prefabricated bridge deck 12 template on a prefabricated pedestal of a prefabrication factory, laying prefabricated slab longitudinal steel bars 15, prefabricated slab transverse steel bars 14 and anchoring steel bars 16, pouring prefabricated bridge deck 12 concrete, demolding when the strength of the concrete reaches over 90 percent of a design value, and storing to form a superposed sub-beam 1;
3) the overlapped sub-beams 1 and the like are transported to a bridge location through beam transporting equipment, the side fulcrum steel cross beam 13 and the middle fulcrum steel cross beam 14 are hoisted in advance, then each overlapped sub-beam 1 and the midspan steel cross beam 4 are hoisted and installed on a temporary support, then the top plate of the upper first connecting longitudinal beam 21 reserved on the side fulcrum steel cross beam and the top plate of the second connecting longitudinal beam 31 reserved on the middle fulcrum steel cross beam are welded with the top plate of the steel longitudinal beam 11, and the web plates and the bottom plates of the first connecting longitudinal beam 21 and the second connecting longitudinal beam 31 are bolted with the web plates and the bottom plates of the steel longitudinal beam 11 to complete full-bridge erection;
4) laying a cast-in-situ bridge deck 18 and a reinforcing mesh at the longitudinal cast-in-situ joint 17, and pouring cast-in-situ bridge deck 18 and longitudinal cast-in-situ joint 17 concrete;
5) after the strength of the concrete reaches the design strength, installing a permanent support, and dismantling the temporary support to complete the system conversion from simple support to continuous support;
6) and constructing bridge deck pavement, railings and other accessory facilities to complete full-bridge construction.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (10)

1. The utility model provides a composite beam suitable for city bridge which characterized in that: the composite bridge deck slab comprises a plurality of composite sub-beams (1) which are arranged in parallel in the transverse direction, wherein each composite sub-beam (1) comprises a steel longitudinal beam (11) and a concrete prefabricated bridge deck (12), a shear part (13) is fixedly arranged on each steel longitudinal beam (11) and extends out of the upper side of each prefabricated bridge deck (12), transverse reinforcing steel bars (14), longitudinal reinforcing steel bars (15) and anchoring reinforcing steel bars (16) are arranged in each prefabricated bridge deck (12), each transverse reinforcing steel bar (14) and each longitudinal reinforcing steel bar (15) extend out of the outer side of each prefabricated bridge deck (12), each anchoring reinforcing steel bar (16) extends out of the upper side of each prefabricated bridge deck (12), a concrete longitudinal cast-in-place seam (17) is arranged between every two transversely adjacent prefabricated bridge decks (12), and cast-in-place concrete bridge decks (18) are arranged on each prefabricated bridge deck (12) and each longitudinal.
2. The composite beam suitable for urban bridges of claim 1, wherein: a midspan steel cross beam (4) is fixedly arranged between two transversely adjacent steel longitudinal beams (11).
3. The composite beam suitable for urban bridges of claim 1, wherein: the thickness of the lower part of the prefabricated bridge deck (12) in contact with the steel longitudinal beam (11) is larger than that of the two sides.
4. The composite beam suitable for urban bridges of any one of claims 1 to 3, wherein: the folding device is characterized by further comprising two side fulcrum beams (2), at least one middle fulcrum beam (3) is arranged between the two side fulcrum beams (2), and a plurality of folding sub-beams (1) are connected between the side fulcrum beams (2) and the middle fulcrum beams (3) close to the side fulcrum beams (2) and between the adjacent two middle fulcrum beams (3).
5. The composite beam suitable for urban bridges of claim 4, wherein: the side fulcrum beam (2) and the middle fulcrum beam (3) are both cast-in-place beams, a post-cast section (19) is reserved at one end, close to the middle fulcrum beam (3), of the cast-in-place bridge deck (18), and the upper end of the middle fulcrum beam (3) extends to the post-cast section (19).
6. The composite beam suitable for urban bridges of claim 5, wherein: the middle fulcrum beam (3) is a high-performance concrete cast-in-place beam.
7. The composite beam suitable for urban bridges of claim 4, wherein: the steel beam is characterized in that the edge fulcrum beam (2) and the middle fulcrum beam (3) are steel beams, a plurality of first connecting longitudinal beams (21) are reserved on the inner side of the edge fulcrum beam (2) along the length direction, the first connecting longitudinal beams (21) are fixedly connected with the steel longitudinal beams (11) close to the edge fulcrum beam (2) in a one-to-one correspondence mode, a plurality of second connecting longitudinal beams (31) are reserved on the two sides of the middle fulcrum beam (3) along the length direction, and the second connecting longitudinal beams (31) are fixedly connected with the steel longitudinal beams (11) close to the middle fulcrum beam (3) in a one-to-one correspondence mode.
8. The construction method of a composite girder applicable to an urban bridge according to any one of claims 1 to 7, wherein: the method comprises the following steps:
s1, manufacturing each steel longitudinal beam (11) and presetting a shearing force piece (13) on each steel longitudinal beam (11);
s2, erecting a prefabricated bridge deck (12) template, laying transverse steel bars (14), longitudinal steel bars (15) and anchoring steel bars (16) in the prefabricated bridge deck (12), pouring concrete of the prefabricated bridge deck (12), demolding and storing to form a superposed sub-beam (1);
s3, transferring the superposed sub-beams (1) to a bridge site, and hoisting each superposed sub-beam (1) to be placed on the pier top temporary support;
s4, laying a cast-in-situ bridge deck (18) and a reinforcing mesh at the longitudinal cast-in-situ seam (17), and pouring concrete of the cast-in-situ bridge deck (18) and the longitudinal cast-in-situ seam (17);
s6, after the concrete strength meets the design requirement, installing a permanent support, and removing a temporary support to complete the system conversion from simple support to continuous support;
and S7, constructing auxiliary facilities of the bridge floor to finish full-bridge construction.
9. The construction method of the composite girder applicable to urban bridges according to claim 8, wherein: in the step S4, after concrete of the cast-in-place bridge deck (18) and the longitudinal cast-in-place seam (17) is poured, reinforcing steel bars of the side fulcrum beam (2) and the middle fulcrum beam (3) are bound, and then concrete of the side fulcrum beam (2) and the middle fulcrum beam (3) is poured.
10. The construction method of the composite girder applicable to urban bridges according to claim 8, wherein: in the step S1, the side fulcrum beam (2) and the middle fulcrum beam (3) are manufactured while the steel longitudinal beams (11) are manufactured, in the step S3, the side fulcrum beam (2) and the middle fulcrum beam (3) are hoisted firstly, then the superposed sub-beams (1) are hoisted, the superposed sub-beams (1) are fixedly connected with the corresponding side fulcrum beam (2) or middle fulcrum beam (3), and full-bridge erection is completed.
CN202010201545.4A 2020-03-20 2020-03-20 Combined beam suitable for urban bridge and construction method thereof Pending CN111254800A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112482231A (en) * 2020-11-27 2021-03-12 上海宝冶冶金工程有限公司 Construction method for prefabricated section of upper structure of viaduct
CN112502017A (en) * 2020-11-03 2021-03-16 中铁大桥勘测设计院集团有限公司 Durable web butt-joint type prefabricated combined beam bridge and construction method
CN113832826A (en) * 2021-10-09 2021-12-24 南京理工大学 Prestressed concrete slab beam bridge type and construction method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112502017A (en) * 2020-11-03 2021-03-16 中铁大桥勘测设计院集团有限公司 Durable web butt-joint type prefabricated combined beam bridge and construction method
CN112482231A (en) * 2020-11-27 2021-03-12 上海宝冶冶金工程有限公司 Construction method for prefabricated section of upper structure of viaduct
CN113832826A (en) * 2021-10-09 2021-12-24 南京理工大学 Prestressed concrete slab beam bridge type and construction method thereof

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